Canonical scattered context generators of sentences with their parses

  • Authors:
  • Alexander Meduna;Jirí Techet

  • Affiliations:
  • Department of Information Systems, Faculty of Information Technology, Brno University of Technology, Boetchova 2, Brno 61266, Czech Republic;Department of Information Systems, Faculty of Information Technology, Brno University of Technology, Boetchova 2, Brno 61266, Czech Republic

  • Venue:
  • Theoretical Computer Science
  • Year:
  • 2007

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Abstract

Scattered context generators derive their sentences followed by the corresponding parses. This paper discusses their two canonical versions, which make this derivation either in a leftmost or rightmost way. It demonstrates that for every recursively enumerable language, L, there exists a canonical scattered context generator whose language consists of L's sentences followed by their parses. In fact, this result is established based on the generators containing no more than six nonterminals.